[CNVM] Unify error handling UX

[jeniawhite]

Motivation

When handling unexpected errors the table disappears (examine screenshot)
The preferred way would be to show the table with its previous state and have a toaster notification about the error without affecting the current state when the server returns an error.

Origin issue (when mapping where missing)

Describe the bug

Not all of the fields in the findings table of vulnerability are mapped.
This PR should have solved this:

• [Cloud Security] [CNVM] Added mappings to vulnerability integrations#5915

For some reason when I've had a system with pre-existing vulnerabilities, it wasn't handled (attempted to run a new transform).
This did not help and I would have expected my index to be updated.
I can also see the old mappings in the index.

Expected behavior
The table shouldn't crash when we sort any fields.

Screenshots

[kfirpeled]

@opauloh verified to me it doesn't happen after fixing the mappings
I'm lowering the priority of this issue to 2 as this is an edge case

[opauloh]

Tested with @nick-alayil this doesn't happen anymore on new instance

[kfirpeled]

Reopening the issue to improve our error handling

[kfirpeled]

Related to this issue, another tech debt from the past: #152944 (comment)
If you think it worth creating another issue for it and it is not relevant to this one, please do

[kfirpeled]

could be related issue: #157954